From HPO
Dilation of Virchow-Robin spaces- MedGen UID:
- 342926
- •Concept ID:
- C1853618
- •
- Finding
Increased dimensions of the Virchow-Robin spaces (also known as perivascular spaces), which surround the walls of vessels as they course from the subarachnoid space through the brain parenchyma. Perivascular spaces are commonly microscopic, and not visible on conventional neuroimaging. This term refers to an increase of size of these spaces such that they are visible on neuroimaging (usually magnetic resonance imaging). The dilatations are regular cavities that always contain a patent artery.
Seizure- MedGen UID:
- 20693
- •Concept ID:
- C0036572
- •
- Sign or Symptom
A seizure is an intermittent abnormality of nervous system physiology characterized by a transient occurrence of signs and/or symptoms due to abnormal excessive or synchronous neuronal activity in the brain.
Lissencephaly- MedGen UID:
- 78604
- •Concept ID:
- C0266463
- •
- Finding
A spectrum of malformations of cortical development caused by insufficient neuronal migration that subsumes the terms agyria, pachygyria and subcortical band heterotopia. See also neuropathological definitions for 2-, 3-, and 4-layered lissencephaly.
Cerebellar hypoplasia- MedGen UID:
- 120578
- •Concept ID:
- C0266470
- •
- Congenital Abnormality
Cerebellar hypoplasia is a descriptive term implying a cerebellum with a reduced volume, but a normal shape and is stable over time.
Macrogyria- MedGen UID:
- 120579
- •Concept ID:
- C0266483
- •
- Congenital Abnormality
Pachygyria is a malformation of cortical development with abnormally wide gyri with sulci 1,5-3 cm apart and abnormally thick cortex measuring more than 5 mm (radiological definition). See also neuropathological definitions for 2-, 3-, and 4-layered lissencephaly.
Gray matter heterotopia- MedGen UID:
- 452349
- •Concept ID:
- C0266491
- •
- Finding
Heterotopia or neuronal heterotopia are macroscopic clusters of misplaced neurons (gray matter), most often situated along the ventricular walls or within the subcortical white matter.
Global developmental delay- MedGen UID:
- 107838
- •Concept ID:
- C0557874
- •
- Finding
A delay in the achievement of motor or mental milestones in the domains of development of a child, including motor skills, speech and language, cognitive skills, and social and emotional skills. This term should only be used to describe children younger than five years of age.
Spastic tetraparesis- MedGen UID:
- 658719
- •Concept ID:
- C0575059
- •
- Disease or Syndrome
Spastic weakness affecting all four limbs.
Abnormal cerebral white matter morphology- MedGen UID:
- 181756
- •Concept ID:
- C0948163
- •
- Pathologic Function
An abnormality of the cerebral white matter.
Hypoplasia of the brainstem- MedGen UID:
- 334226
- •Concept ID:
- C1842688
- •
- Finding
Underdevelopment of the brainstem.
Subcortical band heterotopia- MedGen UID:
- 336288
- •Concept ID:
- C1848201
- •
- Disease or Syndrome
Subcortical band heterotopia is a condition in which nerve cells (neurons) do not move (migrate) to their proper locations in the fetal brain during early development. (Heterotopia means "out of place.") Normally, the neurons that make up the outer surface of the brain (cerebral cortex) are distributed in a well-organized and multi-layered way. In people with subcortical band heterotopia, some neurons that should be part of the cerebral cortex do not reach it. These neurons stop their migration process in areas of the brain where they are not supposed to be and form band-like clusters of tissue. Since these bands are located beneath the cerebral cortex, they are said to be subcortical. In most cases, the bands are symmetric, which means they occur in the same places on the right and left sides of the brain.\n\nThe abnormal brain development causes neurological problems in people with subcortical band heterotopia. The signs and symptoms of the condition depend on the size of the bands and the lack of development of the cerebral cortex. The signs and symptoms can vary from severe intellectual disability and seizures that begin early in life and affect both sides of the brain (generalized seizures) to normal intelligence with seizures occurring later in life and affecting only one side of the brain (focal seizures). Some affected individuals also have weak muscle tone (hypotonia), loss of fine motor skills such as using utensils, or behavioral problems. Subcortical band heterotopia is typically found when brain imaging is done following the onset of seizures, usually in adolescence or early adulthood.
Agyria- MedGen UID:
- 361827
- •Concept ID:
- C1879312
- •
- Congenital Abnormality
A congenital abnormality of the cerebral hemisphere characterized by lack of gyrations (convolutions) of the cerebral cortex. Agyria is defined as cortical regions lacking gyration with sulci great than 3 cm apart and cerebral cortex thicker than 5 mm.
Ventriculomegaly- MedGen UID:
- 480553
- •Concept ID:
- C3278923
- •
- Finding
An increase in size of the ventricular system of the brain.
Intellectual disability- MedGen UID:
- 811461
- •Concept ID:
- C3714756
- •
- Mental or Behavioral Dysfunction
Intellectual disability, previously referred to as mental retardation, is characterized by subnormal intellectual functioning that occurs during the developmental period. It is defined by an IQ score below 70.
Secondary microcephaly- MedGen UID:
- 608952
- •Concept ID:
- C0431352
- •
- Finding
Head circumference which falls below 2 standard deviations below the mean for age and gender because of insufficient head growth after birth.
Axial hypotonia- MedGen UID:
- 342959
- •Concept ID:
- C1853743
- •
- Finding
Muscular hypotonia (abnormally low muscle tone) affecting the musculature of the trunk.
- Abnormality of the cardiovascular system
- Abnormality of the musculoskeletal system
- Abnormality of the nervous system